CVE-2021-42875Public exploitNetwork attack vector

Unauthenticated command execution via ipDoamin injection

Published Jun 2, 2022 · Updated Jul 9, 2026

OS command injection in TOTOLINK EX1200T firmware 4.1.2cu.5215 allows remote attackers to execute commands via a crafted ipDoamin value. The setDiagnosisCfg handler in lib/cste_modules/system.so passes the ipDoamin field from JSON into a shell command without neutralizing embedded newlines or operators. An unauthenticated POST to /cgi-bin/cstecgi.cgi can run processes and write command output to files with the web service's privileges.

CVSS severity9.8
Critical
EPSS probability4.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in TOTOLINK EX1200T firmware 4.1.2cu.5215 allows remote attackers to execute commands via a crafted ipDoamin value. The setDiagnosisCfg handler in lib/cste_modules/system.so passes the ipDoamin field from JSON into a shell command without neutralizing embedded newlines or operators. An unauthenticated POST to /cgi-bin/cstecgi.cgi can run processes and write command output to files with the web service's privileges.

The record

CVE
CVE-2021-42875
Published
Jun 2, 2022
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 2, 2022CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

10.0NIST NVDAV:N/AC:L/Au:N/C:C/I:C/A:C
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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